Earth moving device



R. E. CHOATE ET AL EARTH MOVING DEVICE Fild Sept. 5, 19:53

H Arromvify Mum/117L526;

Patented Feb. 15,1938

UNITED STATES."

PATENT m nsn'rn uovmo. nnvrcn Roy E. Choate', Waldo E. Rodler, and William v I. Leech, Cedar Rapids, Iowa, assignors to La Plant-Cho'ate Manufacturing Co. Inc., Cedar Rapids, Iowa, a corporation of Delaware Application'september 5, 1933, Serial No.688.178

1 Claim.

This invention relates to earth moving devices and has particular relation to devices in which a scraper blade is mounted for pivotal movement in front of a tractor or like prime mover. v

5 In devices of the character with which we are now concerned a pair of frameworks are pivotally attached, one on each side of a tractor, to the ing and actuating mechanism, or other parts of the tractor.

After considerable study of this problem we have reached the conclusion that the undue compression of the springs which support the tractor on'the sub-frames is caused by thereaction set up by .the hydraulic jack which actuates the frame raising and lowering mechanism. We have found that, if the reaction set up in the jack by pushing the piston rod in and out is conveyed to sub-frames of the tractor, undue compression" of the tractor supporting springs is avoided.

We have, therefore, devised a meansior con veying the reactive forces set up in the hydraulic jack directly to the sub-frame of the tractor, and

in-this way have avoided the dimculties abovetractor.

mentioned.

A general'object of our invention is to provide means for conveying certain forces set up in a. plow actuating mechanism to members which are not harmed by'such forces. I I

A more specific object of our invention is to provide in anearth moving device a t ==ge system for conveying the reactive force of aplow actuating mechanism to the sub-frame of the tractor.

Another object of our invention is to provide guide means for guiding the side frames of an earth moving device of the type here considered. Another object of our invention is to provide means wherebyundue compression of the tractor supporting, springs is avoided.

Other and further features and objects at our invention will be more apparent to those skilled in the art upon a consideration of the accompanying drawing and following specification, wherein is disclosed an exemplary embodiment of the invention, with the understandi, however, thatsuoh changes may be made therein as fall within the scope of the appended claim with- 50 out departing from the spirit of the invention.

Number 610,194, Patent Number 2,030,352.

snb frames it by means of coil springs or the projectingchannel member 22,'with members i9 In said drawing:

Figure l is a side 'view in perspective of a tractor to which a scraper blade, blade-supporting side frames, and a blade actuating mech-' anism constructed according to our. invention 5 have been attached, and

Figure 2 is a quartering view in perspective of a portion of the track, the track supporting subframe, a hydraulic jack, and a jack supporting linkage constructed according to our invention.

We are hereprincipally. concerned with the means by which reactive forces on the A Jack are transmitted to the sub-frame of the tractor, in order to "by-pass" these fcrces around the tractor supporting springs. We are, there- 15 fore only incidentally concerned, at this time with the scraper blade, scraper blade mounting,

side'frames, and the side frame actuating shaft and levers. A more detailed description of these parts is given in a co-pending application by Herbert H. Pearson, filed August 18, 1932, Serial Number 629,297, Patent Number 136L011 on earth moving devices, and a co-pending applica- 'tion by Roy E. Cheats" and Waldo E. Rodler on earth moving devices, tilled May '9, 1932, Serial 25 Referring to the drawing, there'is shown at it generally, a tractor having a sub-frame or track frame it, on which the tractor is resiliently mounted, and wheels it and track belt it for suppo the sub-frame.

The tractor is'supported with relation to the like (not shown) in order that shocks or follows on the suit -frames will not be transmitted to the fine of the stiflening or supporting members Y of the sub-frame i l isa longitudinally-extending channel member if, and. the wheelbearings, in

dicated generally at it, are attached to this channel' member it. v

A pair of triangular side-frame members, in=

'dicated generally at. ll, are pivotally attached,

one on each side of the tractor, to the mid-point projecting channel member 2i, and a rearwardiy and I! joined at their front end by means or a plate 23, and atthe rear ends'by means oil a cap 24. The mid-point of the frame-members is N stifiened by means 'of a plate 2t.

Thelower or forward end of the member 22 is provided with a, pair of brackets El and 28 having means for engaging across shaft 29, which in turn is iournaled in the brackets IS. The scraper blade 3i is'fastened to the front ends at the side framemembers l1 and this scraper and the blade 3! is lowered, or may even be our invention.

versal Joints in order that it may be any desired position.

A cross-shaft 32 extends across the rear of the tractor, and a bifurcated lever arm 38 is attached to the'outer end of the shaft 32 so that when pressure is applied to the piston rod 34 the lever arm 33a is moved to rotate'the shaft 32 and thus rotate the lever arm 33b. Rotation of the lever arm 33b in one direction or the other causes a corresponding movement of the rear ends of the side frames i! in a corresponding direction by reason of the connecting links 38.

The piston rod 34 is moved in and out by means of a hydraulic jack, the cylinder of which is indicated at 31. Fluid for actuating the piston of the hydraulic jack is introduced into the Jack by means of the hose connections 38 and. It is apparent that if fluid is introduced into the jack through-the hose connection 39 the piston rod 34 will be pushed outwardly to rotate the lever 33 in a counter-clockwise direction to draw down the rear end of the side frames i1 and thus raise the scraper blade; When fluid is introduced into the Jack through the hose II a reverse movement of the parts of the device occurs moved to forced downwardly by the hydraulic jack.

It is apparent that when hydraulic pressure is applied to the Jack 31 the piston rod 34 is forced outwardly or inwardly, and a corresponding force or reaction is set up in the cylinder of the hydraulic jack. This reactive force usually acts in a substantially horizontal plane and drives the mounting of the Jack forwardly or rearwardly, thus at times causing the tractor to pivot about at substantially its mid-point to compress the tractor supporting springs. It is. of course, very desirable'to avoid this last named condition and this is one of the main objects of In order to avoid undue compression of the tractor supporting springs, and undue stresses in other parts of the tractor, we havedevised a means for transferring the reactive force set up in the jack by the actuation of the scraper blade manipulating means, directly from the jack to the sub-frame and running gear.

One means for obtaining this result is illustrated in the drawing. In this device trunnion bearings 42 areprovided at the rear end and on top of the platform, fender or running board 4|, and a lever arm or link, comprised of a channel member 43, extends forwardly from, and is' pivotally attached to, the trunnion bearings 42. Upstruck trunnion brackets 44 are secured to the lever arm at an intermediate point thereof at a position along the length of the arm which is so chosen that least movement of the tractor occurs when the scraper blade is being manipulated. The hydraulic jack cylinder 31 is pivotally supported by these trunnion brackets 44 in order to permit the cylinder to pivot as the arm Ila rotates. The pivot points of the cylinder 31 on the link 43 may be at any point along these respecting members. A rub iron plate 46 is secured to the outermost of the trunnion brackets 44 and acts in cooperation with a plate 41 on frame members l9 and 22 as a guide to prevent weaving or side-motion ofthe side frame members.

The free end of the lever arm or link 4! is blade is suitably curved and provided with uniope'ratively engaged tothe sub-frame channel member l4 by means of a ladder-like yoke 44. This yoke 44 is provided with a bracket member 40 at its upper end in order that the yoke may be engaged to the lever arm 48 as by means of the pivot pin ll. A cross-member l2 aids in stiffening the yoke member.

The lower end of the yoke member 44 is pivotally attached to the channel members II and I4 by means of a rub iron bracketindicated at If. This rub iron bracket is recessed as indicated at 83 in order that it may be secured to the channel members II, as by means of bolts ll and'fl of the side frame members and thus act as an additional guiding means for the side frame members to take any transverse or lateral forces set up in-the scraper blade. The rub iron bracket" 52 is provided with tip-struck lugs 41 at the upper portion thereof, in order that the yoke 48 may be pivotally attached thereto, as by means of pivot pins 58.

The inner lower end of the yoke 48 is attached to the inner portion of the sub-frame II by means of a second bracket 52d which is of the same construction as the bracket 52 previously described, but which is fastened to the sub-frame in reversed position.

It is apparent that the reactive forces set up in the jack and particularly at the lack cylinder are transmitted directly to the sub-frame of the tractor and thence to the ground, thus avoiding compression of the tractor supporting springs and avoiding breakage of the tractor parts. Furthermore it is apparent that simple means have been provided for guiding the side frame members of the scraper blade manipulating mechanism. I

It is obvious that the reactive forces in the jack and other parts may be transmitted to the ground by other means or that they may be transmitted to some part of the tractor where the force can do no harm. These and other modifications may be made by those skilled in the art without departing from the spirit and scope of our invention as set forth in the ap-- pended claim.

We claim as our invention:

In an earth moving device including a tractor andrunning gears for the tractor, aside frame pivotally mounted on the running gears and extending substantially the length of the tractor and projecting in front thereof, a plow blade mounted on the front end of the side frame, a cross shaft pivotally mounted at the rear of the tractor and having a lever arm fixed thereon, a link for connecting the lever arm on the cross shaft with the rear end of the side frame, a hydraulic jack and a support for the Jack comprising a platform pivotally mounted on the rear portion of the tractor'and extending forwardly therefrom and a link for connecting the free end Roy E. cnoa'm. wamo a. aonmm. wnmm I. macs. 

